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soc: mediatek: cmdq: Add cmdq_pkt_jump_rel() helper function

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cmdq_pkt_jump_rel() append relative jump command to the packet.
Relative jump change PC to the target address with offset from
current PC.

Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240222154120.16959-5-chunkuang.hu@kernel.org
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
This commit is contained in:
Chun-Kuang Hu 2024-02-22 15:41:12 +00:00 committed by AngeloGioacchino Del Regno
parent 7218be3b6f
commit 698cdcb195
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GPG Key ID: 9A3604CFAD978478
2 changed files with 29 additions and 0 deletions
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10
drivers/soc/mediatek/mtk-cmdq-helper.c
View File

@ -404,6 +404,16 @@ int cmdq_pkt_jump_abs(struct cmdq_pkt *pkt, dma_addr_t addr, u8 shift_pa)
}
EXPORT_SYMBOL(cmdq_pkt_jump_abs);
int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
{
struct cmdq_instruction inst = { {0} };
inst.op = CMDQ_CODE_JUMP;
inst.value = (u32)offset >> shift_pa;
return cmdq_pkt_append_command(pkt, inst);
}
EXPORT_SYMBOL(cmdq_pkt_jump_rel);
int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
{
struct cmdq_instruction inst = { {0} };

19
include/linux/soc/mediatek/mtk-cmdq.h
View File

@ -267,6 +267,20 @@ static inline int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr, u8 shift_
return cmdq_pkt_jump_abs(pkt, addr, shift_pa);
}
/**
* cmdq_pkt_jump_rel() - Append jump command to the CMDQ packet, ask GCE
* to execute an instruction that change current thread
* PC to a physical address with relative offset. The
* target address should contains more instruction.
* @pkt: the CMDQ packet
* @offset: relative offset of target instruction buffer from current PC.
* @shift_pa: shift bits of physical address in CMDQ instruction. This value
* is got by cmdq_get_shift_pa().
*
* Return: 0 for success; else the error code is returned
*/
int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa);
/**
* cmdq_pkt_finalize() - Append EOC and jump command to pkt.
* @pkt: the CMDQ packet
@ -393,6 +407,11 @@ static inline int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr, u8 shift_
return -EINVAL;
}
static inline int cmdq_pkt_jump_rel(struct cmdq_pkt *pkt, s32 offset, u8 shift_pa)
{
return -EINVAL;
}
static inline int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
{
return -EINVAL;